defence exam Agniveer Army GD Mock Test Series 2025 General Science Chemistry

सर्वात हलके किरणोत्सर्गी मूलद्रव्य कोणते आहे?

1
ड्युटेरियम
2
पोलोनियम
3
ट्रिटियम
4
युरेनियम
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